Growing strands with particles
You can use a Halo material and Trail Particles to do this.


Use a turbulence force field to create the random motion. (You can also use the Brownian value in Particles &gt; Physics, but I liked the motion created by the turbulence force-field better)


Set the Trail count up. 700 may be a bit much if you have a lot of particles, and unnecessary if your particles don't move very fast.


Use a Halo material for the particles: